| 摘要 |
PROBLEM TO BE SOLVED: To inhibit the inner cracks and surface cracks of a bloom further by inhibiting the generation of bulging on a narrow face side. SOLUTION: In a bloom casting method, a vertical bending type continuous bloom casting machine 1 is used to cast a bloom having a narrow face size of 250 mm to 450 mm, and containing a carbon content of 0.4 to 1.0% and a chromium content of 0.2 to 1.6%. The method appropriately defines the casing velocity of the continuous bloom casting machine 1, the distance from the casting die 4 to the narrow face support roll 7 on the upper-most stream side, and a surface temperature and a cooling velocity in the narrow surface center at various positions. COPYRIGHT: (C)2009,JPO&INPIT
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